I’ve loaded a kit in GrooveAgentSE5 and clicked PLAY button to audition what it sounds like.
The “Load Program to Selected Slot” window is open so I can double-click other kits to explore and find what I’m looking for, while the playback is still playing inside GrooveAgent. Unfortunately, even if it is still playing, the new kit loaded will not be heard until playback is stopped and started again inside Groove Agent. 
Please fix so that we don’t have to stop/start playback everytime we want to hear the new loaded kit.